Enhanced d_{x^2-y^2} pairing correlations in the two-leg Hubbard ladder

Physics – Condensed Matter – Superconductivity

Scientific paper

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6 pages including 10 eps figures, uses revtex and epsfig

Scientific paper

10.1103/PhysRevB.56.7162

The two-leg Hubbard ladder is characterized by the ratio of the inter- to intra-leg hopping t_perp/t, the relative interaction strength U/t and the electron filling. Here, using density matrix renormalization group and Monte Carlo simulations, we examine the dependence of the pairing correlations on these parameters. We find that the pairing correlations are enhanced when the top of the bonding quasiparticle band and the bottom of the antibonding band are near the Fermi level. We present results on the single-particle spectral weight and the antiferromagnetic correlations in order to explain this behavior.

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